I'm just about to plug that "granny charger" in to see how it works, I've switched the tumble drier & washing machine off as any more load of this antiquated shared loop electric system would blow the old wired fuses
Still waiting on the DNO to upgrade our supply, It was supposed to get upgraded on the 21-22nd January but the chap in the end house in this block of three tested positive for covid so the electricity board cancelled
The biggest fuse we have in that old bakerlite fuse board is only 30amp.